www/node8: Update 8.11.3_2 -> 8.11.4

This is a security release addressing multiple vulnerabilities. Users
are recommended to upgrade as soon as possible.

https://nodejs.org/en/blog/vulnerability/august-2018-security-releases/
https://nodejs.org/en/blog/release/v8.11.4/

MFH: 2018Q3
Security: 0904e81f-a89d-11e8-afbb-bc5ff4f77b71
Sponsored by: Miles AS